MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
NEET
NEET Biology MCQ
Embryonic Development Mcq
Quiz 3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Q.1
Trophectoderm takes part in ... ... [ kerala 2003 ]
0%
a) Protection of embryo
0%
b) Formation of ectoderm
0%
c) Formation of placenta
0%
d) Drawing food for developing cells
Explanation
The trophectoderm is a layer of cells on the outer edge of a blastocyst. These cells provide nutrients for the developing embryo, facilitate implantation into the uterine lining and become part of the placenta. Answer : (d)
Q.2
Type of placenta present in human/Rabbit is ... ... [ MPPMT 2002 ]
0%
a) Metadiscoidal
0%
b) Zonary
0%
c) Diffuse
0%
d) Cotyledonary
Explanation
Metadiscoidal: Placenta is diffused first but later becomes discoidal. Example: human beings, apes and rabbit. Answer : (a)
Q.3
Blastocyst is blastula of ... ... [ MPPMT 1995 ]
0%
a) Platypus
0%
b) kangaroo
0%
c) Monkey
0%
d) Both B and C
Explanation
In mammals, the blastula is referred to as a blastocyst. The blastocyst contains an embryoblast (or inner cell mass) that will eventually give rise to the definitive structures of the fetus, and a trophoblast which goes on to form the extra-embryonic tissues. Answer : (d)
Q.4
Which one is produced by mesoderm? [ JKMCEE 1994 ]
0%
a) Heart and notochord
0%
b) Heart and brain
0%
c) Spinal cord and notochord
0%
d) brain and notochord
Explanation
Brain, spinal cord is derived from ectoderm. Heart and notochord is derived from mesoderm. Answer : (a)
Q.5
Liver and pancreas develop from ... ... [ MPPMT 1998 ]
0%
a) Ectoderm
0%
b) Endoderm
0%
c) Mesoderm
0%
d) Both A and B
Explanation
Liver and pancreas develop from endoderm. Answer : (b)
Q.6
Meroblastic cleavage is division ... ... [ CBSE 1992 ]
0%
a) horizontal
0%
b) telolecithal
0%
c) Centrolecithal
0%
d) Alecithal
Explanation
Meoblastical cleavge is seen in insects. Insect eggs are centrolecithal in nature. Answer : (c)
Q.7
Ectoderm forms ... ...
0%
a) Bones and muscles
0%
b) Lining of gut and respiratory organs
0%
c) Enamel of teeth and cornea of eye
0%
d) Gonads and blood vessels
Explanation
Epidermis of skin, nails, enamel of teeth, skin glands, eye lens etc., originate from ectoderm. Answer : (c)
Q.8
The discoblastula is found in ... ... [ MPPMT 2011 ]
0%
a) Birds/Reptiles
0%
b) Man
0%
c) Branchiostoma
0%
d) Rana
Explanation
Discoblastula: In such blastula the floor of blastocoel is formed of yolk sac, while roof is formed of epiblast. Example: birds and reptiles. Answer : (a)
Q.9
Noncleidoic eggs occur in ... ... [ BHU 2001 ]
0%
a) Birds
0%
b) Fish
0%
c) Reptiles
0%
d) Platypus
Explanation
Non-cleidoic eggs: Egg is not covered with shell. Egg membranes are squashy in these eggs e.g. All viviparous animals and in oviparous animals that put down eggs in water. For example – fish. Answer : (b)
Q.10
Extra-embryonic membranes of mammalian embryo are derived from ... ... [ CBSE 1994 ]
0%
a) Inner cell mass
0%
b) Trophoblast
0%
c) Formative cells
0%
d) Follicle cells
Explanation
The extraembryonic membranes of the mammalian embryo are derived from trophoblast, after the cleavage of the zygote, the blastocyst is formed. Answer : (b)
Q.11
During embryogenesis archenteron is preceded by .... ...
0%
a) Blastulation
0%
b) Neurulation
0%
c) Gastrulation
0%
d) Implantation
Explanation
The primary gut that forms during gastrulation in the developing zygote is known as the archenteron, the gastrocoel or the primitive digestive tube. Answer : (c)
Q.12
In humans, cleavage divisions are ... .... [ DPMT 2011 ]
0%
a) Slow and synchronous
0%
b) Slow and asynchronous
0%
c) Fast and synchronous
0%
d) Fast and asynchronous
Explanation
Cleavage begins soon after karyogamy. The first cleavage occurs along primary axis. It takes about 30 hours. The first cleavage divides the egg into two blastomeres. One is slightly larger than the other. Therefore, first division is holoblastic but slightly unequal. The difference in size makes subsequent divisions asynchronous. Mammalian cleavage is slow, irregular, and is asynchronous. Answer : (b)
Q.13
What is true about cleavage in fertilized egg of humans? [ CBSE 1994 ]
0%
a) Meroblastic
0%
b) Starts when egg reaches uterus
0%
c) Starts in fallopian tube
0%
d) It is identical to normal mitosis
Explanation
Cleavage starts in the zygote almost immediately. So the cleavage in the fertilized egg of humans starts in the fallopian tube. Answer : (c)
Q.14
Which one is correct ... .. [ Odisha 2002 ]
0%
a) Cleavage follows gastrulation
0%
b) Yolk content of egg has no role in cleavage
0%
c) Cleavage is repeated mitotic division of zygote
0%
d) gastrulation and blastulation follow each other
Explanation
Cleavage is a series of rapid mitotic divisions of the zygote, charcterised by absence of growth of daughter cells, which convert the the single celled zygote into multicellular structure called blastula (blastocyst). Answer : (c)
Q.15
Eye develops from ... ... [ CPMT 1998 ]
0%
a) Ectoderm
0%
b) Mesoderm
0%
c) Endoderm
0%
d) Both A and B
Explanation
Eye lens are derived from ectoderm. Muscles of eye ball originated from mesoderm. Answer : (d)
Q.16
Which is derived from ectoderm? [ DPMT 1996 ]
0%
a) Epidermis
0%
b) Spinal cord
0%
c) Retina
0%
d) All the above
Explanation
All the three options are derived from ectoderm. Answer : (d)
Q.17
Rearrangement of layers/morphogenetic movements occur during ... ... [ Wardha 2002 ]
0%
a) Gastrulation
0%
b) Blastulation
0%
c) Morulation
0%
d) Organogenesis
Explanation
Transformation of the blastocyst into gastrula with primary germ layers by rearrangement of the cells is called gastrulation. In all the triploblastic animals three germ layers - ectoderm, mesoderm and endoderm are formed. These germ layers are formed by charcteristic movements of some of the cells. Thses cellular movements are known as morphogenetic movements. Answer : (a)
Q.18
Gastrula has a pore known as ... ... [ KCET 2010 ]
0%
a) Zoospore
0%
b) Oospore
0%
c) Gonopore
0%
d) Blastopore
Explanation
Blastopore is found in the gastrula. It is the pore which leads to the development of gastrula by forming an opening into the developing embryo or gastrula. Answer : (d)
Q.19
Which one is not from ectoderm? [ CPMT 1996 ]
0%
a) Notochord
0%
b) Epidermis
0%
c) Internal ear
0%
d) Branchial arches
Explanation
Notochord originates from mesoderm. Answer : (a)
Q.20
Due to presence of large amount of yolk, zygote divides into two incomplete halves. This type of cleavage does not occur in ... ... [ manipur 2005 ]
0%
a) Peacock, Duck-billed Platypus and Crocodile
0%
b) Jungle Fowl, Dove and Duck
0%
c) Amphioxus, Salamander and Rana
0%
d) Hemidactylus, Calotes and Varanus
Explanation
Holoblastic, unequal:- the cleavage in which segmentation line divides egg into two unequal halves. This type of cleavage is seen in amphibians. Rana (frog) and salamander are amphibians. The egg of amphioxus is isolecithal and the cleavage is of holoblastic type. Answer : (c)
Q.21
Mesoderm proliferates from ... ...
0%
a) Trophoblast
0%
b) Cephalic end of embryonic disc
0%
c) Caudal end of embryonic disc
0%
d) Ectoderm of embryonic disc
Explanation
Hypolast and epiblast form a disc called embryonic disc. Gastrulation involves the rearrangement and migration of cells from the epiblast. A primitive streak which is a faint on dorsal surface of the epiblast is formed. It elongates from the posterior to the entire part of the embryo. Posterior part of the embryo is caudal end. Answer : (c)
Q.22
Meroblastic cleavage is ... ... { MHTCET 2002 ]
0%
a) Total
0%
b) Spiral
0%
c) Incomplete
0%
d) Horizontal
Explanation
Meroblastic cleavage: The incomplete cleavage in telolecithal or megalecithal eggs of animals, such as birds and reptiles. Answer : (c)
Q.23
Solid ball of cells formed at the end of cleavage is ... ... [ MPPMT 1994 ]
0%
a) Morula
0%
b) Blastula
0%
c) Blastocyst
0%
d) Blastodisc
Explanation
Cleavage divisions produce a solid ball of cells called morula. Answer : (a)
Q.24
Secondary sexual characters in females develop in response to hormone ... ... [ MPPMT 2002]
0%
a) Relaxin
0%
b) Progesterone
0%
c) Estrogen
0%
d) Gonadotropin
Explanation
At the onset of puberty, estrogen plays a role in the development of so-called female secondary sex characteristics, such as breasts, wider hips, pubic hair and armpit hair. Estrogen also helps regulate the menstrual cycle, controlling the growth of the uterine lining during the first part of the cycle. Answer : (c)
Q.25
Egg of Cockroach is ... ... [ BHU 2008]
0%
a) Alecithal
0%
b) Oligolecithal
0%
c) Centrolecithal
0%
d) Microlecithal
Explanation
Centrolecithal: Yolk is concentrated in the centre in the centre and the cytoplasm is peripheral. Example insect eggs. Cockroach is an insect. Answer : (c)
Q.26
The eggs of some mammals have more yolk. They are ... .... [ MPPMT 1992 ]
0%
a) Aquatic mammals
0%
b) Metatherians
0%
c) Prototherians
0%
d) Eutherians
Explanation
Mammals which lay eggs have sufficient amount of yolk. While placental mammals has little to no yolk. Egg laying mammals are called prototherians. Answer : (c)
Q.27
During cleavage ... .... [ Wardha 2002 ]
0%
a) Size of resulting cells decreases
0%
b) Size of resulting cells increases
0%
c) Size of early embryo increases
0%
d) Size of early embryo decreases
Explanation
Interphase in cleavage division is short and does not involve growth so that the resulting blastomeres become smaller in size as their number increases. Answer : (a)
Q.28
A cell formed from cleavage is called ... ... [ manipal 2004]
0%
a) Blastomere
0%
b) Blastopore
0%
c) Blastula
0%
d) Morula
Explanation
The one cell embryo undergoes a series of cleavage divisions, progressing through 2-cell, 4-cell, 8-cell and 16 cell stages. The cells in cleavage stage embryos are known as blastomeres. Answer : (a)
Q.29
Foetal membrane that provides the first blood corpuscle for circulation in embryo is ... ... [ MPPMT 1995 ]
0%
a) Trophoblast
0%
b) Yolk sac
0%
c) Amnion
0%
d) Chorion
Explanation
Yolk sac: It is formed below the embryo as a vascularized membrane. It contains fluid, not yolk. Its wall first consisits of trophoblast and endoderm (primary yolk sac), but later comes to consist of endoderm and mesoderm (secondary yolk sac). The yolk sac is nonfunctional in human beings except that it functions as site of blood cell formation unitl about the 6th week, when the liver takes over this role. Thereafter, the yolk sac strats to shrink. Answer : (b)
Q.30
'Cells of Rauber' are ... ... [ AIIMS 2012 ]
0%
a) inner cell mass of blastocoel
0%
b) Secretory cells of endometrium
0%
c) Trophoblast cells in contact with uterine wall
0%
d) Trophoblast cells in contact with inner cell mass of blastocyst
Explanation
With the formation of blastocoel, morula is converted into blastula. Inner cell mass now looks like a small knob at one pole. The knob give rise to embryo and is called embryonal knob. Trophoblast cells in contact with the embryonal kob are called cells of Rauber. Answer : (d)
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page